Duchamp was one of the most influential and original artists of the 20th century. He rejected the constraints of painting and believed (both as an intellectual and in his material practice) that contemporary art should reconnect with its history in a radical, transgressive manner. La Mariée mise à nu par ses célibataires, même (The Bride Stripped Bare by her Bachelors, Even—‘The Large Glass’) (1915–1923) exemplified the complexity and daring of his ideas, which were re-revealed in his striking last work Étant Donnés (1946–1966), a secret installation that was only made public after his death. His concept of the ‘Readymade’ defied established notions of authorship and contributed to the opening up of the field of art later associated with postmodernism.